B. The construction has four times the tensile strength of steel has is idiomatically incorrect. The correct construction is has four times the tensile strength of steel. 都有xx of steel了怎么还能加has呢。。
Black bear cubs use trees for defense, whereas brown bears and polar bears, which regularly inhabit treeless environments, rely on aggression to protect their cubs. Like brown bears and polar bears (and unlike other myrmecophagous mammals, which are noted for their passivity), sloth bears are easily provoked to aggression
定位问题
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问题是选择“best”help，与一份合同、一张建筑图纸、餐具、一些陶具相比，数不清的F国人的牙齿更有力度。