A large envelope marked with “DO NOT THROW AWAY” catches the mother’s attention. What’s inside it（）

A . white light FL (2) and a topmark of 2 black spheres B . occulting green light and may be lettered C . yellow light and will be numbered D . continuous quick white light and may be numbered

A . have more resistance to listing in case of damage B . have less tendency to have synchronous rolling C . be less likely to have cargo shift D . ride more comfortably

A . wreck B . shoal area C . anchorage area D . middle ground

A . the centerline of a navigable channel B . the starboard side of a channel C . a prominent object of navigational interest that has no lateral significance D . an area of a channel where passing another vessel is permitted

A . maximum working pressure B . bursting pressure C . safety relief valve setting D . maximum temperature

A . cluster B . shower C . constellation D . galaxy

A . very quick flashing B . flashing C . fixed D . occulting

A . at B . on C . i

A . Aero light B . Radar station C . Radar transponder beacon D . Radiobeaco

A . Checkpoint （CKPT） B . Process Monitor （PMON） C . Archiver Processes （ARCn） D . Recoverer Process （RECO） E . Memory Manager process （MMAN）

A . Issue a show policy-map interface command.  B . Assuming Netflow is enabled, issue a show ip cache verbose flow command. C . Issue a show crypto ipsec session command. D . Issue a debug qos set command and a terminal monitor command.

A . Checkpoint （CKPT） B . Process Monitor （PMON） C . Archiver Processes （ARCn） D . Recoverer Process （RECO） E . Memory Manager process （MMAN）

A . a high pressure area with cool, dry air and fair weather B . a high pressure area with warm, moist air and inclement weather C . horse latitudes, with rough seas and strong winds D . a heavy squall line near the “H&rdquo

In the early nineteenth century, people did not use stamps. They had to pay postage (邮费) when they received letters. Sometimes they didn't want to receive a letter at all, but they had to pay money for it. They were unhappy about this. The postage was high at that time, because the post offices had to send many people to get the postage. Rowland Hill was a school teacher in England. He was the first to think of using stamps in 1850s. He thought it would be much easier for people to use stamps. People could go to the post office to buy stamps and put them on envelopes before they sent the letters. The post office could just put seals (邮戳). on the stamps so that people could not use the stamps again. In this way, the post office did not need to send post men to get postage. It only needed fewer postmen to send letters. People began to use stamps ______. A．at the beginning of the nineteenth century B．in the middle of the nineteenth century C．more than two hundred years ago D．when people first sent letters and postcards.

A、 captive pricing B、 retail price maintenance C、 price discrimination D、 competitive pricing E、 unfair price skimming

A．The Prince and the Pauper B．On the Mississippi C．The Adventures of Tom Sawyer D．The Adventures of Huckleberry Finn

A、to smile B、smile C、smiled D、being smiled