单选题 Scientists from the Scott Polar Research Institute at Cambridge say that a slow (93)human who does not (94) the nest too closely, is not viewed as a (95) by penguins.

单选题 Clark became aware that he had lost his audience since he had not been able to talk ___ around on one topic.

单选题 Rescue workers continued the delicate task of sifting through tons of concrete and ___ to try to reach possible survivors.

单选题 The word prey in paragraph 2 is closest in meaning to____。

单选题 A decades years ago, the American government ___ most of the railroad passenger routes from private company which were losing money on passenger service.

单选题 State government provided employment and training services for workers and compensation for those who are ___ out of work.

单选题 Lois and her husband decided to share all the housework and they will see to their cooking of the three meals on ___ day.

单选题 In paragraph3, the underlined word "it" refers to ____

单选题 The broad aim of the conference was that experts working in the same technical area should meet to exchange ___