2. 外语
  3. Because fuel supplies are finite and many people are wasteful, we will have to install______solar heating device in our home.

Because fuel supplies are finite and many people are wasteful, we will have to install______solar heating device in our home.

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问题 Because fuel supplies are finite and many people are wasteful, we will have to install______solar heating device in our home.
选项 A、some type of
B、some types of a
C、some type of a
D、some types of
答案A
解析 “device”为单数可数名词，因此可排除B、C；从句意看，D(某些种类)也不符合要求。所以，正确答案为A。
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