Bicycling is good exercise; _______, it does not pollute the air.
A．nevertheless B．besides C．otherwise D．therefore
B
句意：騎自行車是一種很好的運動，而且，還不污染空氣。本題考查連詞的用法。連詞的選擇主要從上下文的邏輯關系出發(fā)來考慮。此處，is good exercise和doesn’t pollute the air之間應為順承關系，所以選besides。而nevertheless“然而”表轉折關系，otherwise“否則”表選擇關系，therefore“因此”表因果關系，故都排除。
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