This tree produces rubber.（英译中)

A . show i p ospf B . show ip ospf interface C . show ipv6 ospf interface D . show ipv6 ospf

A . show ip ospf B . show ip ospf interface C . show ipv6 ospf interface D . show ipv6 ospf

A . a great deal of B . much C . a large amount of D . a lot of

A . AAA client and AAA server handshake failure B . supplicant authentication failure C . wrong password used by the supplicant D . failure of the wireless client and AAA server handshake

A . on B . for C . at D . in

A . failure of the wireless client and AAA server handshake B . supplicant authentication failure C . AAA client and AAA server handshake D . Wrong password used by the supplicant

A . If BPDUs are received by a port configured for PortFast， they are ignored and none are sent. B . The command will enable BPDU filtering on all ports regardless of whether they are configured for BPDU filtering at the interface level. C . If BPDUs are received by a port configured for Portfast， the port will transition to forwarding state. D . If BPDUs are received by a port configured for PortFast， then PortFast is disabled and the BPDUs are processed normally. E . None of the other alternatives apply.

A . failure of the wireless client and aaa server handshake B . supplicant authentication failure C . aaa client and aaa server handshake D . wrong password used by the supplicant

A . BPDU guard can be used to prevent invalid BPDUs from propagating throughout the network.  B . BPDU guard can guarantee proper selection of the root bridge. C . BPDU guard can be utilized to prevent the switch from transmitteing BPDUs and incorrectly altering the root bridge election. D . BPDU guard can be utilized along with PortFast to shut down ports when a switch is connected to the port. E . None of the other alternatives apply

A . avoid B . keep C . stop D . dro

A .  errpt -t  B .  errpt -a  C .  errpt -D  D .  errpt

A . failure of the wireless client and AAA server handshake B . supplicant authentication failureB.AAA client and AAA server handshake failure C . wrong password used by the supplicant

【B4】______ , in many parts of the world, man has not realized that the 【B5】______ of these services is the most important. In his eagerness to draw quick profit from the trees, he has cut them down in large 【B6】______ , only to find that 【B7】______ them he has lost the best friend he had. Two 【B8】______ years ago a rich and powerful country cut down its trees to build warships 【B9】______ to gain itself an empire. It gained the empire, but without its trees, its soil became hard and poor. When the empire 【B10】______ to pieces, the home country found itself faced by floods and starvation. 【B11】______ a government realizes the importance of a plentiful supply of trees, it is difficult for it to persuade the villager to see this ,the villager wants wood to cook his food 【B12】______ ; and he can earn money by making charcoal or selling wood to the townsman. He is usually too lazy or too 【B13】______ to plant and look after new trees. So, 【B14】______ the government has a good system of control, or can educate the people, the forests slowly disappear. This does not only mean that the villagers' sons and grandsons have 【B15】______ trees. The results are even more serious; for where there are trees their roots break the soil up allowing the rain to sink in and also bind the soil, thus preventing 【B16】______ washed away on the surface, causing floods and carrying 【B17】______ ground away 【B18】______ it the rich top-soil, in which crops grow so well. When all the top-soil is 【B19】______ , nothing remains 【B20】______ worthless desert. A．with B．at C．in D．through

A:对 B:错

A、You’re wrong B、I don’t think so， I’m afraid C、Not at all D、No， that’s not real

A．had planted B．will have planted C．will plant D．has planted

Big oil firms (4)_____ rolling in money today, but that disguises the fact that their longer-term prospects are (5)_____. Behind the reserves-accounting scandal at Royal Dutch/ Shell (6)_____ a problem bedeviling all of the majors: replacing their dwindling reserves. (7)_____ existing fields in Alaska and the North Sea are rapidly declining, OPEC countries and Russia are (8)_____ them out. (9)_____ they are to survive in the long term, the big oil firms must embrace other sources of energy (10)_____ oil. (11)_____ it is to believe, higher oil prices could be bad news for producing countries (12)_____. Political leaders in Russia, Venezuela and other oil-rich countries are bending laws to crack (13)_____ on foreign firms and to strengthen their grip on oil (14)_____ through state-run firms. This may be convenient for the political leaders themselves. Alas, it is (15)_____ to do much for their countrymen. For years corruption and inefficiency (16)_____ the typical results of government control of oil resources. Producing countries should (17)_____ embrace open markets. (18)_____ one thing, shutting out foreign investment will only hurt their own oil output by (19)_____ the sharpest managers and latest technologies. For another, economic liberalisation (including reform. of bloated welfare states) would help OPEC countries (20)_____ their economies—as the NAFTA trade deal has done for oil-rich Mexico—and so prepare them for the day when the black gold starts running out. A．ones B．shock C．prices D．countries