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【单选题】
正常人体内及体表多处有葡萄球菌存在而不引起人的疾病，其中最主要的带菌部位是A.
咽喉
B.
皮肤
C.
鼻腔
D.
肠道
E.
泌尿道
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【单选题】Tom sits ____ the classroom while John sits ____ the room. [ ]
A.
in front of; at back of
B.
in the front of; at the back of
C.
in front of; at the back of
D.
in the front of; at back of
【简答题】（13分）现有下列短周期元素性质的相关数据： ① ② ③ ④ ⑤ ⑥ 原子半径（10－10m） 1.30 0.82 0.99 1.11 0.90 1.18 最高或最低化合价 +2 +3 +7 +4 +2 +3 －1 －4 请回答下列问题： （1）②和③形成的化合物类型为 （填“离子”或“共价”）化合物； （2）元素①的金属性比元素⑥要 （填“强”或“弱”），试从原子结构方面解释其原因： ； （3）...
【单选题】______ Chicago is a beautiful city today, but ______ Chicago of the 1920s was a very dirty place.
A.
The the
B.
//
C.
A the
D.
/the
【单选题】Since Chicago is north of Washington, and Washington is north of Charleston, Chicago is north of Charleston.
A.
Chicago is north of Washington. Washington is north of Charleston. _____________________________ ∴ Chicago is north of Charleston.
B.
Chicago is north of Charleston. Washington is north of Charleston. ____________________________ ∴ Chicago is north of Washington.
【单选题】Sandy sits in front of Amy, but behind Simon. So Sandy sits ______ Amy ______ Simon. [ ]
A.
next; to
B.
next to; beside
C.
between; and
D.
opposite; at
【单选题】One's first impression of Chicago may be ______.
A.
large population
B.
streams of cars
C.
the late spring
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