【加賴叫過去】評論
The details of the program—open only to a few hundred test riders, and with human safety operators remaining behind the wheel—may be not that _______ but don’t erase its significance.該計劃的細節（僅向幾百名測試乘客開放，而駕駛座依舊備有人類的安全操作員）可能並沒有那麼 _______，但它的重要性仍然是無法抹滅的。(A) pessimistic --> 悲觀(B) encouraging --> 令人振奮(C) bizarre --> 奇怪(D) disappointing --> 令人失望