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【单选题】
患病时口腔内微生物大量繁殖的原因是A.
消化功能减退
B.
口腔内湿度改变
C.
口腔内温度改变
D.
致病菌多于非致病菌
E.
机体抵抗力降低
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举一反三
【单选题】Where are they?
A.
They are in a shop.
B.
They are in the restaurant.
C.
They are in a large department store.
D.
They are in the library.
【多选题】What do animals may use to help remember where they are, where they have been and where they are going?
A.
the sun
B.
the moon
C.
the stars
D.
the sea
E.
the earth
F.
landmarks
G.
the beach
【单选题】Where are they?
A.
They are dancing.
B.
They are travellers.
C.
They are in the park.
【单选题】This is the hotel _______last month. A. which they stayed B. at that they stayed C. where they stayed at D. where they stayed
A.
which they stayed
B.
at that they stayed
C.
where they stayed at
D.
where they stayed
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