题目列表(包括答案和解析)

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50.A improve    B produce    C rise        D raise

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49.A production   B pollution   C population     D revolution

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48.A too many  B a few    Csome     D few

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47.A still    B even      C also     D certainly

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46.A Thus    B However     C Generally speaking  D Therefore

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45.A grow   B plant       C save      D cut down

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44.A continue  B have       C ought     D go on

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43.A mountains  Bthe sea      C trees     D forests

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42.A poles    B boats      C methods    D ideas

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41.A wonders   Brealizes     C considers   D discovers

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