单项选择题

A．always live in rivers and streams without going to se……

According to the introductions about the endangered fish, we can infer that mostPacific salmon and steelhead

A．always live in rivers and streams without going to seas.
B．always live in seas and oceans without going to rivers.
C．live in rivers when young and live in seas when grown-up.
D．live in seas when young and live in rivers when grown-up.

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单项选择题Which of the following statements about ESA's protection efforts is NOT true

A．ESA plans to extend its protection to the endangered fish in other areas.
B．It will be expensive to apply ESA's regulations for protecting the fish.
C．The new listings will Somewhat affect the urban life of some regions.
D．ESA's protection planshave always been supported by local people.

单项选择题According to the passage, setting up airline alliances will chiefly benefit

A．North American airlines and their domestic travellers.
B．North American airlines and their foreign counterparts.
C．Asian airlines and their foreign travellers.
D．Asian airlines and their domestic travellers.

单项选择题One disadvantage of alliances foreseen by the critics is that air travel may be moreexpensive as a result of

A．less convenience.
B．higher operation costs.
C．less competition.
D．more joint marketing.

单项选择题Which of the following is NOT a perceived advantage of alliances

A．Baggage allowance.
B．Passenger comfort.
C．Convenience.
D．Quality.

单项选择题According to the passage, which of the following categories of travellers will gainmost from airline alliances

A．Travellers who fly frequently economy class.
B．Travellers who fly frequently business class.
C．Travellers who fly occasionally during holidays.
D．Travellers who fly economy class once.in a while.