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【简答题】
在HF、H 2 O、NH 3 、CS 2 、CH 4 、N 2 、BF 3 分子中： (1)以非极性键结合的非极性分子是________； (2)以极性键结合的具有直线形结构的非极性分子是________； (3)以极性键结合的具有正四面体形结构的非极性分子是________； (4)以极性键结合的具有三角锥形结构的极性分子是________； (5)以极性键结合的具有sp2杂化轨道结构的分子是________。
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【单选题】Which of the following is NOT a reason for designing small group speaking tasks?
A.
Students feel shy speaking a foreign language in front of a whole class.
B.
Small group speaking tasks are easier.
C.
Speaking in small groups is more natural.
D.
Small group work helps students learn to work cooperatively.
【简答题】A．The same as at the old one. B．Small group and individual ones. C．Small group ones only. D．Individual ones only.
【简答题】A．The same as at the old one. B．Small group and individual ones. C．Small group ones only. D．Individual ones only.
【单选题】According to the passage, the dynamics of small group economies differ from those of large group economies in that
A.
the members of small groups tend to have a greater degree of social regularity than the members of large groups
B.
people in small groups carry an advantage in the arena of exchange because they are tied by social obligation
C.
the manufacturer of a commodity in a small group economy is more likely to be known by the members of the group
D.
the people who contribute to the production of a gift are less essential to small groups than those who exchange commodities are in large groups
E.
a system of social obligation diminishes the number of parties necessary to a gift-giving transaction
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